The last available software update (Build number 4.1.B.0.587) is based on Android 4.0.4, and works good except for a few critical bugs that the unsupported users now have to live with. The only sadness is that the item is out of support - both on the software as well as hardware sides, primarily because Sony and Ericsson parted ways. The Sony Ericsson Xperia Arc S LT18i, an excellent phone of its times, is still a pretty decent phone to live with with all that Sony goodness in it.
